Combo Systems - Integrated Heat Pump (IHP)
Integrated Heat Pump (IHP) is an evolution of the HPWH. The
IHP delivers space heating and cooling, water heating and
fairly sophisticated control system is required to match space
conditioning and water heating demand for maximum efficiency
and to control the charge inventory in the different operating
modes. The cost of these controls and multiple valves, plus
the interconnection between the heat pump and water storage
tank, adds approximately $1,200 or more to the installed cost
compared to a comparably performing space conditioning only
On demand water heating and space heating and cooling
are provided. In the space cooling mode, water heating is
provided by "free heat" rejected from the space
cooling mode. During periods of low cooling load, the water
heating load may exceed the rejected heat from space cooling.
To meet the additional water heating load, the integrated
heat pump operates in ambient air source heat pump mode.
periods of no space conditioning loads or periods with a space
heating load, water is heated in ambient air source heat pump
mode, with the heat output shared between water and space
the ambient temperature falls below the balance point, the
water is heated by back-up electric resistance heat.
The combined effect of the heating, cooling and water
heating modes is a 65% to 75% reduction in water heating energy
consumption compared to electric resistance.
Diagram of Intergrated Heat Pump Design